Quick Changes Dialings: The nitrogens purge tool have a quick and easy 3click position dialings.Quickly switches between Purge,Braze,and Off setting to get the correct amount of nitrogens flows for each 1 Standard Fittings: Quickly attaches to the outlet of a standard nitrogens pressure regulator.Set the purge tool to off,connecting standard 1/4in refrigerants hoses,and in second you is ready to purge and braze 50Psi Inlet Pressure: Be sure you have enough pressure to purge and braze properly.Nitrogens Purge Tool is design to regulate proper nitrogens flows with a 50psi inlet pressure.Most pressure of 200psi Purge Setting=25-35 scfh@ 50psi,Braze setting=3-6scfh@ 50psi Not fumbling with flows indicators valves. Robusts Design: The Nitrogens Purge Tool is design to be toughly and durability.Throw it into your tool bag.It will not break like nitrogens flows meter, Manufacturer: Shurhome